Originally Posted by
SKT-DK
Maybe I was not elaborate enough, apologies - the scenario is that we would have a legal, same-day transit via LHR to a Schengen country, thus not having a UK visa for her. Hence, wondering what would happen in the scenario where cancellations would cause an over-night stay.
The UK Border Force has the discretion to admit people under various criteria, including transport disruption, and they will also be (painfully) aware of BA's shortcomings. T5 also closes at night and the BF don't like people camping out in their area. So depending on the specifics I wouldn't expect a problem here, so long as the BF is satisfied that they will leave the UK at the earliest sensible opportunity.